CAMTA3的DNA结合活性对其功能至关重要:识别其转录活动的关键氨基酸
Kasavajhala V S K Prasad1, Amira A E Abdel-Hameed1,2, Qiyan Jiang1,3
1Department of Biology and Program in Cell and Molecular Biology, Colorado State University, Fort Collins, CO 80523, USA.
Cells
|August 11, 2023
概括
像CAMTA3这样的卡尔莫杜林结合转录激活剂 (CAMTA) 对植物免疫非常重要. 我们的研究表明,CAMTA3
科学领域:
- 植物分子生物学 植物分子生物学
- 植物免疫力 植物免疫力
- 信号传递的.
背景情况:
- 素结合转录激活剂 (CAMTA) 是参与介导信号传递的转录因子.
- 阿拉比多普西斯中的CAMTA3调节了生物和非生物应激反应,并调节了植物免疫力.
- 以前的研究表明,CAMTA3的转录活性可能是其免疫功能不可缺少的.
研究的目的:
- 研究DNA结合活性在植物免疫反应中CAMTA3的功能中的作用.
- 为了确定CAMTA3DNA结合 (CG-1) 域内的关键氨基酸残留物,这是其功能所必不可少的.
主要方法:
- 在CAMTAs的CG-1域中对保存的氨基酸的分析.
- 在CAMTA3 CG-1域中保存残留物的位点定向突变发生.
- 电泳运动转移试验 (EMSAs) 来评估DNA结合活性.
- 暂时的记者基因测试用于评估转录激活.
- 在转基因Arabidopsis系中进行补充分析.
主要成果:
- 在CG-1域中突变了6个保存的氨基酸,取消了CAMTA3的DNA结合活性.
- 这些突变还废除了CAMTA3激活RSRE驱动的记者基因表达的能力.
- 突变CAMTA3的转基因表达未能拯救camta3突变表型或恢复下游基因表达.
结论:
- CAMTA3的DNA结合活性对于其在植物免疫反应中的作用至关重要.
- 在CG-1域内的特定氨基酸残留对CAMTA3的DNA结合和转录功能至关重要.
- 对于调解植物免疫,CAMTA3的转录活性是不可或缺的.
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